the world > the earth > structure of the earth > constituent materials > rock > composite rock > [noun] > agglomerate (3)
Geology. Originally: a rock consisting of a mass of coarse fragments, esp. of lava. In later use: spec. a rock consisting of volcanic bombs and…
Geology. Rock consisting of coarse fragments of volcanic ejecta embedded in a glassy matrix or cemented together by a glassy material; a mass of…